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동결융해에 의한 매트릭스 붕괴와 콘크리트의 염해 저항성 평가
오상균(Oh Sang-Gyun),김정길(Kim Jung-Kil),황효재(Hwang Hyo-Jae) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.9
Recently, the number of concrete building structures in marine environment increases because many people prefer to the excellent landcape and the good view. By this, it is increased the damage as a chloride from the sea. Thus, concern of long-term durable is growing larger and many researches of chloride study are predicting the chloride. it is important to study and predict the durability and the compound deterioration along admixture addition and the high strength concrete itself which is appraised through the promotion chloride ion migration coefficient test by freezing-thawing damage. The concrete's resistance against freezing and thawing is tested based on KS F 2456, while its chloride ion migration coefficient is evaluated based on NT BUILD 492. In results of this study obtained as follows; (1) As high strength concrete is exposed to freezing and thawing process, the compressive strength and service life decreases, but the amount of chloride ion diffusion coefficient increases. (2) As concrete is exposed to freezing and thawing process, the compressive strength and the amount of chloride ion diffusion coefficien and service life does not change according to addition of admixture.
폐콘크리트 미분말을 이용한 재생시멘트의 물성과 성능개선
오상균(Oh Sang-Gyun),김정길(Kim Jung-Kil) 대한건축학회 2002 大韓建築學會論文集 : 構造系 Vol.18 No.12
Recently, the study to reduce and recycle industrial waste is underway vigorously in the various fields of industry according to the conservation of environment and resources. In construction work, the disposal problem of its waste and environmental disruption have already been serious allover the world. However the recycle of waste concrete is still at an early stage, recycled aggregate from waste concrete have only used those as subsidiary road fillers. The research institute and the company make the study that it is about the properties of recycled aggregate and those structural capacity since 1990. Through the experimentation last year, we know that strength and fluidity of recycle cement are inferior to normal cement, and admixing aggregate powder deteriorates its strength. The purpose of this study is to search for appropriate heating time and to improve performance of the recycle cement while heating hardened cement which is crushed, we investigate separating aggregate from hardened cement by preheating and improvement of strength and fluidity in recycle cement which contains admixture.
골재특성에 따른 콘크리트의 염화물이온 확산에 대한 연구
오상균(Oh Sang-Gyun),김정길(Kim Jung-Kil),신종만(Shin Jong-Man) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.7
Recently, a lot of buildings are constructed near marine environment because many people prefer to the excellent landscape and the good view. therefore, it is increased the damage as a chloride from the sea. For this reason, many researches of chloride ion penetration have been conducted but there is no study about the effect of aggregate in concrete. So, the purpose of this study are predicting the chloride ion diffusion coefficient and life of concrete by the properties of aggregate. In this experiment, the effect on chloride ion diffusion coefficient and the durability of concrete were investigated along with the change of grading and s/a of aggregate. As the result, the effect of the properties of aggregate on chloride ion diffusion coefficient and the durability of concrete are too little to evaluate it. And diffusion coefficient in steady state was evaluated as low as 1/10 of that in non-steady state. In the future, this study need to estimate the effect of aggregate on chloride diffusion coefficient at high-strength concrete.
혼화재료에 의한 재생시멘트의 레올로지 및 강도특성 개선
오상균 ( Sang Gyun Oh ),임승준 ( Seung Jun Im ),김정길 ( Jung Kil Kim ) 한국건축시공학회 2003 한국건축시공학회 학술발표대회 논문집 Vol.3 No.1
Recently, the study to reduce and recycle industrial waste is underway vigorously in the various fields of industry according to the conservation of environment and resources. In construction work, the disposal problem of its waste and environmental disruption have already been serious all over the world. However the recycle of waste concrete is still at an early stage, recycled aggregate from waste concrete have only used those as subsidiary road fillers. The research institute and the company make the study that it is about the properties of recycled aggregate and those structural capacity since 1990. Through the experimentation last year, we know that strength and fluidity of recycle cement are inferior to normal cement, and admixing aggregate powder deteriorates its strength. The purpose of this study is to search for appropriate heating time and to improve performance of the recycle cement while heating hardened cement which is crushed, we investigate separating aggregate from hardened cement by preheating and improvement of strength and fluidity in recycle cement which contains admixture.
시멘트계 접합부의 유도가열에 의한 승온특성 및 공극구조
강동우 ( Dong Woo Kang ),안재철 ( Jae Cheol Ahn ),김정길 ( Jung Kil Kim ),강병희 ( Byeung Hee Kang ) 한국건축시공학회 2011 한국건축시공학회 학술발표대회 논문집 Vol.11 No.1
The purpose of this study is to suggest basic data for development optimal disassembly manufacturing system during analysis pore structure and heating properties of cementitious joint using conductive resister by induction heating. From the results, we knew cementitious joint is weak easily by heating of conductive resister, such as wire mesh, punching metal, and steel fiber, from induction heating.